ABB ACS880 - Page 542

Def / Type
FbEq 16b / 32b
DescriptionName / Range /
Selection
No.
2Underload limit is calculated by using the formula:
I
lim
= I
set
* (F
act
/ F
max
)
2
Where,
I
lim
= 79.90 Overload actual limit
I
set
= 79.43 Overload limit
F
max
= 79.09 Load limit speed scale
F
act
= Actual speed
Quadratic
3Overload limit depends on the user input load curve,
actual speed/frequency and Overload supervision input.
User curve
Motor current % /
unit32
Defines the source for the supervision signal used in
the overload protection.
Overload
supervision signal
79.42
0ZeroNULL
112.12 AI1 scaled value (page 226).AI1 scaled
212.22 AI2 scaled value (page 228).AI2 scaled
43.5 FB A reference 1 (page 179).FB A ref1
53.6 FB A reference 2 (page 179).FB A ref2
83.9 EFB reference 1 (page 179).EFB ref1
93.10 EFB reference 2 (page 179).EFB ref2
7Parameter 9.13 Motor current estimated.Estimated motor
current
8Estimated motor current in % of nominal motor current.Motor current %
See Terms and abbreviations (page 169).Other [value]
100.00 / real32Defines overload limit value.
Note: This parameter is not applicable in case User
curve is selected for the overload curve shape in
parameter 79.41 Overload limit type.
Overload limit79.43
10 = 1 / 100 = 1Overload fixed limit.0.00 ... 30000.00
Constant / unit32Selects the type of overload delay time setting.
The user has option to choose between fixed and
floating delay calculation methods.
Overload delay type79.47
0Overload limit depends on the user input load curve,
actual speed/frequency and Overloadload supervision
input.
Constant
1T
act
= T
set
* (I
lim
/ I
act
)
Where,
T
act
= 79.91 Overload trip count down
T
set
= 79.48 Overload delay time
I
lim
= 79.90 Overload actual limit
I
act
= 79.42 Overload supervision signal
Linear
2T
act
= T
set
* (I
lim
/ I
act
)
2
Where,
T
act
= 79.91 Overload trip count down
T
set
= 79.48 Overload delay time
I
lim
= 79.90 Overload actual limit
I
act
= 79.42 Overload supervision signal
Quadratic
542 Parameters